<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>form简介</title>
</head>
<body>

<form action="#" method="get">

    <label>用户名</label><input name="username"/>
    <label>密码</label><input name="password"/>
    <button type="button">提交</button>
</form>

</body>
</html>